c語言LOBYTE函數 c語言ioctl函數

c 獲取串口號 c 自動獲取串口號

用C怎么寫獲取串口的內容

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看驅動程序的接口啊

一般是是open(“口名”)

用C/C++寫一個小程序讀取串口接收到的數據

你太幸運了，剛好我有一個，你在vc++6.0下測試一下。

/* serrecv.c */

/* Receives and saves a file over a serial port */

/* Last modified: Septemeber 21, 2005 */

/* [goman89] */

#include

/* Function to print out usage information */

void usage(void);

/* Function to set up the serial port settings with the specified baud rate,

no parity, and one stop bit */

void set_up_serial_port(HANDLE h, long baud);

/* Function to receive and save file from serial port */

void get_file_from_serial_port(HANDLE h, char *file_name, unsigned long file_length);

int main(int argc, char **argv)

{

HANDLE serial_port; /* Handle to the serial port */

long baud_rate = 9600; /* Baud rate */

char port_name[] = "COM1:"; /* Name of serial port */

unsigned long file_size; /* Size of file to receive in bytes */

unsigned long bytes_received; /* Bytes received from serial port */

unsigned long file_name_size; /* Size of file name in bytes */

char file_name[256]; /* Name of file to receive */

/* Check mand line */

if (argc == 3)

{

/* Read in baud rate */

if (argv[1][1] != 'b' || sscanf(argv[2], "%ld", baud_rate) != 1)

{

usage;

exit(0);

}

else if (argc != 1)

{

usage;

exit(0);

}

/* Open up a handle to the serial port */

serial_port = CreateFile(port_name, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);

/* Make sure port was opened */

if (serial_port == INVALID_HANDLE_VALUE)

{

fprintf(stderr, "Error opening port\n");

CloseHandle(serial_port);

exit(0);

}

/* Set up the serial port */

set_up_serial_port(serial_port, baud_rate);

/* Receive file name size from serial port */

ReadFile(serial_port, (void *)file_name_size, sizeof(unsigned long), bytes_received, NULL);

if (bytes_received != sizeof(unsigned long))

{

fprintf(stderr, "Error getting file name size.\n");

CloseHandle(serial_port);

exit(0);

}

/* Receive file name from serial port */

ReadFile(serial_port, (void *)file_name, file_name_size, bytes_received, NULL);

if (bytes_received != file_name_size)

{

fprintf(stderr, "Error retrieving file name.\n");

CloseHandle(serial_port);

exit(0);

}

/* Append NULL terminator to end of string */

file_name[bytes_received] = '\0';

/* Receive file size from serial port */

ReadFile(serial_port, (void *)file_size, sizeof(unsigned long), bytes_received, NULL);

if (bytes_received != sizeof(unsigned long))

{

fprintf(stderr, "Error getting file size.\n");

CloseHandle(serial_port);

exit(0);

}

/* Get the file from the serial port */

get_file_from_serial_port(serial_port, file_name, file_size);

/* Print out success information */

printf("\n%lu bytes successfully received and saved as %s\n", file_size, file_name);

/* Close handle */

CloseHandle(serial_port);

return 0;

}

void usage(void)

{

fprintf(stderr, "Usage:\n");

fprintf(stderr, "\tserrecv [-b baud rate]\n");

fprintf(stderr, "\tDefault baud rate is 9600\n");

fprintf(stderr, "tSupported baud rates: 1200, 2400, 4800, 9600, 14400, 19200\n");

return;

}

void set_up_serial_port(HANDLE h, long baud)

{

DCB properties; /* Properties of serial port */

/* Get the properties */

GetmState(h, properties);

/* Set the baud rate */

switch(baud)

{

case 1200:

properties.BaudRate = CBR_1200;

break;

case 2400:

properties.BaudRate = CBR_2400;

break;

case 4800:

properties.BaudRate = CBR_4800;

break;

case 9600:

properties.BaudRate = CBR_9600;

break;

case 14400:

properties.BaudRate = CBR_14400;

break;

case 19200:

properties.BaudRate = CBR_19200;

break;

case 38400:

properties.BaudRate = CBR_38400;

break;

default:

fprintf(stderr, "Invalid baud rate: %ld\n", baud);

usage;

exit(0);

break;

}

/* Set the other properties */

properties.Parity = NOPARITY;

properties.ByteSize = 8;

properties.StopBits = ONESTOPBIT;

SetmState(h, properties);

return;

}

void get_file_from_serial_port(HANDLE h, char *file_name, unsigned long file_length)

{

FILE *data_file; /* File to create */

unsigned long bytes_left = file_length; /* Bytes left to receive */

unsigned long bytes_received_total = 0; /* Total bytes received */

unsigned long bytes_to_receive; /* Number of bytes to receive */

unsigned long bytes_received; /* Number of bytes receive */

char buffer[200]; /* Buffer to store data */

/* Open the file */

data_file = fopen(file_name, "wb");

/* Quit if file couldn't be opened */

if (data_file == NULL)

{

fprintf(stderr, "Could not create file %s\n", file_name);

CloseHandle(h);

exit(0);

}

while (1)

{

/* Determine how many bytes to read */

if (bytes_left == 0)

{

break;

}

else if (bytes_left 200)

{

bytes_to_receive = bytes_left;

}

else

{

bytes_to_receive = 200;

}

/* Receive data over serial cable */

ReadFile(h, (void *)buffer, bytes_to_receive, bytes_received, NULL);

if (bytes_received != bytes_to_receive)

{

fprintf(stderr, "Error reading file.\n");

CloseHandle(h);

exit(0);

}

/* Save buffer to file */

fwrite((void *)buffer, 1, bytes_received, data_file);

/* Decrement number of bytes left */

bytes_left -= bytes_received;

/* Increment number of bytes received */

bytes_received_total += bytes_received;

/* Print out progress */

printf("\r%5lu bytes received.", bytes_received_total);

}

fclose(data_file);

return;

}

C語言變成實現串口收發數據

#include?

int?main(void)

{

FILE?*fp;

char?temp;

char?buf[100];

if((fp?=?fopen("3","r"))?==?NULL)

puts("this?way?doesn't?work!\n");

else

puts("this?way?works!\n");

while(1)

{

temp?=?0;

fscanf(fp,"%c",temp);

if(temp?!=?0)

putchar(temp);

else

Sleep(100);

}

fclose(fp);

return?0;

}

以前弄的，好久沒看了，不知到對不對。

還有下面這段：

#include?

HANDLE?h;

int?main(void)

{

h=CreateFile(TEXT("COM3"),//COM1口

GENERIC_READ|GENERIC_WRITE,?//允許讀和寫

0,?//獨方式

NULL,

OPEN_EXISTING,?//打開而不是創建

0,?//同步方式

NULL);

if(h==(HANDLE)-1)

{

printf("打開COM失敗!\n");

return?FALSE;

}

else

{

printf("COM打開成功！\n");

}

Setupm(h,1024,1024);?//輸入緩沖區和輸出緩沖區大小都是1024

COMMTIMEOUTS?TimeOuts;

//設讀超時

TimeOuts.ReadIntervalTimeout=1000;

TimeOuts.ReadTotalTimeoutMultiplier=500;

TimeOuts.ReadTotalTimeoutConstant=5000;

//設定寫超時

TimeOuts.WriteTotalTimeoutMultiplier=500;

TimeOuts.WriteTotalTimeoutConstant=2000;

SetmTimeouts(h,TimeOuts);?//設置超時

DCB?dcb;

GetmState(h,dcb);

dcb.BaudRate=9600;?//波特率為9600

dcb.ByteSize=8;?//每個字節有8位

dcb.Parity=NOPARITY;?//無奇偶校驗位

dcb.StopBits=ONE5STOPBITS;?//兩個停止位

SetmState(h,dcb);

DWORD?wCount;//讀取的節數

BOOL?bReadStat;

while(1)

{

Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR);?//清緩沖區

char?str[9]={0};

printf("%s\n",str);

bReadStat=ReadFile(h,str,9,wCount,NULL);

if(!bReadStat)

{

printf("

怎么通過串口讀取51單片機某個地址的數據？請用C語言寫出來。

授人以魚,不如授人以漁

首先，你要明確在C語中讀取內存址是基于指針。

3.比如讀取內存地址0x22中的數據

C語言中對于內存的訪是基于指，這個毋庸置疑，具體操如下

unsigned int *p= （unsigned int*）0x22 ；//定義針，并且使指針指向了0x22這個 ? ? ? ?內存地址；

那么*p就是最終你要讀取的數據了。

4.至于如何通過串口顯示到電腦我就不多了（這不是難點），據你都知道了，寫到串口 ? 緩沖區，在串口調試助手下就可以看到。

5.雖然沒有貼出具體代碼，但這里面的思想可以讓你解決

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Linux下如何使用c/c++實現檢測新增串口，并讀取串口號

Linux下面有設文件

串口裝好驅動后會顯示在dev下

然后對這個

C語言中如何對串口進行操作

C語言會有操作串口的庫函數的，按照串口庫數標識實現調

電腦上的串口號是什么意思

串口叫做串行接口,也串行通信接口,按電氣標準及協議來分包括RS-232-C、RS-422、RS485、USB等。 RS-232-C、RS-422與RS-485標準對接口的電氣特性做出規定,不涉及接插件、電纜或協議。USB是近幾年發展起來的新型接口標準,主要應用于速數據傳輸域。 RS-232-C:也稱標準串口,是目前最常用的一種串行通訊接口。它是在1970年由美國電子工業協會(EIA)聯合貝爾系統、調制解調器廠家及計算機終端生產廠共同制定的用于串行通訊的標準。它的名是“數據終端設備(DTE)和數據通訊設備(DCE)之間行二進制數據交換接口技術標準”。傳統的RS-232-C接口標準有22根線,采用標準25芯D型插頭座。后來的PC上使用簡化了的9芯D插座。現在應用中25芯插頭已很少采用。現在的電腦般有兩個串行口:COM1和COM2,你到計算機后面能看到9針D形接口就是了。現在有很多手數據線或者物流接收器都采用COM

如何用C語言寫一個讀、寫串口的程序？

大致過程就是

配置串口通信，包串口號、波特、驗位、停止位這些信息；

打開串口，和打開文件一樣，在Linux是這樣，Windows下沒試過，估計也差不多；

發送數據，即寫串口，就跟寫文件類似；

讀取

編寫單片機串口收發數據的完整程序（C語言編寫）

我用的新唐芯片，8051內核，跟51差不多，望采納

void UART_Initial (void)

{

P02_Quasi_Mode; //Setting UART pin as Quasi mode for tran *** it

P16_Quasi_Mode; //Setting UART pin as Quasi mode for tran *** it

SCON_1 = 0x50; //UART1 Mode1,REN_1=1,TI_1=1

T3CON = 0x08; //T3PS2=0,T3PS1=0,T3PS0=0(Prescale=1), UART1 in MODE 1

clr_BRCK;

RH3 = HIBYTE(65536 - (1000000/u32Baudrate)-1); /*16 MHz */

RL3 = LOBYTE(65536 - (1000000/u32Baudrate)-1); /*16 MHz */

set_TR3; //Trigger Timer3

}

以上是初始化的

void Send_Data_To_UART1(UINT8 c)

{

TI_1 = 0;

SBUF_1 = c;

while(TI_1==0);

}

這個是發送

void UART_isr (void) interrupt 4 //

怎樣在WINDOWS下用C語言編寫串口接收數據程序

#include

int main(void)

{

FILE *fp;

char temp;

char buf[100];

if((fp = fopen("3","r")) == NULL)

puts("this way doesn't work!\n");

else

puts("this way works!\n");

while(1)

{

temp = 0;

fscanf(fp,"%c",temp);

if(temp != 0)

putchar(temp);

else

Sleep(100);

}

fclose(fp);

return 0;

}

以前的，好久看，不知到對不對。

還下面這段：

#include

HANDLE h;

int main(void)

{

h=CreateFile(TEXT("COM3"),//COM1口

GENERIC_READ|GENERIC_WRITE, //允許讀和寫

0, //獨占方式

NULL,

OPEN_EXISTING, //打開而不是建

0, //同步式

NULL);

if(h==(HANDLE)-1)

{

printf("打開COM失敗!\n");

return FALSE;

}

else

{

printf("COM打開成功！\n");

}

Setupm(h,1024,1024); //輸入緩沖區和輸出緩沖區的大小都是1024

COMMTIMEOUTS TimeOuts;

//定讀超時

TimeOuts.ReadIntervalTimeout=1000;

TimeOuts.ReadTotalTimeoutMultiplier=500;

TimeOuts.ReadTotalTimeoutConstant=5000;

//設定寫超時

TimeOuts.WriteTotalTimeoutMultiplier=500;

TimeOuts.WriteTotalTimeoutConstant=2000;

SetmTimeouts(h,TimeOuts); //設置超時

DCB dcb;

GetmState(h,dcb);

dcb.BaudRate=9600; //波特率為9600

dcb.ByteSize=8; //每個字節有8位

dcb.Parity=NOPARITY; //無奇偶校驗位

dcb.StopBits=ONE5STOPBITS; //兩個停止位

SetmState(h,dcb);

DWORD wCount;//讀取的字節

BOOL bReadStat;

while(1)

{

Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR); //清空緩沖區

char str[9]={0};

printf("%s\n",str);

bReadStat=ReadFile(h,str,9,wCount,NULL);

if(!bReadStat)

{

printf("讀串口

標簽：作文經典上一篇：描寫毛毛蟲的詞語描寫毛毛蟲行動的詞語下一篇：成語誤用褒貶的例子褒貶誤用的成語

求C語言函數大全

函數名: abort

功能: 異常終止一個進程

用法: void abort(void);

程序例:

#include stdio.h

#include stdlib.h

int main(void)

{

printf("Calling abort()\n");

abort();

return 0; /* This is never reached */

}

函數名: abs

功能: 求整數的絕對值

用法: int abs(int i);

程序例:

#include stdio.h

#include math.h

int main(void)

{

int number = -1234;

printf("number: %d absolute value: %d\n", number, abs(number));

return 0;

}

函數名: absread, abswirte

功能: 絕對磁盤扇區讀、寫數據

用法: int absread(int drive, int nsects, int sectno, void *buffer);

int abswrite(int drive, int nsects, in tsectno, void *buffer);

程序例:

/* absread example */

#include stdio.h

#include conio.h

#include process.h

#include dos.h

int main(void)

{

int i, strt, ch_out, sector;

char buf[512];

printf("Insert a diskette into drive A and press any key\n");

getch();

sector = 0;

if (absread(0, 1, sector, buf) != 0)

{

perror("Disk problem");

exit(1);

}

printf("Read OK\n");

strt = 3;

for (i=0; i80; i++)

{

ch_out = buf[strt+i];

putchar(ch_out);

}

printf("\n");

return(0);

}

函數名: access

功能: 確定文件的訪問權限

用法: int access(const char *filename, int amode);

程序例:

#include stdio.h

#include io.h

int file_exists(char *filename);

int main(void)

{

printf("Does NOTEXIST.FIL exist: %s\n",

file_exists("NOTEXISTS.FIL") ? "YES" : "NO");

return 0;

}

int file_exists(char *filename)

{

return (access(filename, 0) == 0);

}

函數名: acos

功能: 反余弦函數

用法: double acos(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = acos(x);

printf("The arc cosine of %lf is %lf\n", x, result);

return 0;

}

函數名: allocmem

功能: 分配DOS存儲段

用法: int allocmem(unsigned size, unsigned *seg);

程序例:

#include dos.h

#include alloc.h

#include stdio.h

int main(void)

{

unsigned int size, segp;

int stat;

size = 64; /* (64 x 16) = 1024 bytes */

stat = allocmem(size, segp);

if (stat == -1)

printf("Allocated memory at segment: %x\n", segp);

else

printf("Failed: maximum number of paragraphs available is %u\n",

stat);

return 0;

}

函數名: arc

功能: 畫一弧線

用法: void far arc(int x, int y, int stangle, int endangle, int radius);

程序例:

#include graphics.h

#include stdlib.h

#include stdio.h

#include conio.h

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

int stangle = 45, endangle = 135;

int radius = 100;

/* initialize graphics and local variables */

initgraph(gdriver, gmode, "");

/* read result of initialization */

errorcode = graphresult(); /* an error occurred */

if (errorcode != grOk)

{

printf("Graphics error: %s\n", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* terminate with an error code */

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

/* draw arc */

arc(midx, midy, stangle, endangle, radius);

/* clean up */

getch();

closegraph();

return 0;

}

函數名: asctime

功能: 轉換日期和時間為ASCII碼

用法: char *asctime(const struct tm *tblock);

程序例:

#include stdio.h

#include string.h

#include time.h

int main(void)

{

struct tm t;

char str[80];

/* sample loading of tm structure */

t.tm_sec = 1; /* Seconds */

t.tm_min = 30; /* Minutes */

t.tm_hour = 9; /* Hour */

t.tm_mday = 22; /* Day of the Month */

t.tm_mon = 11; /* Month */

t.tm_year = 56; /* Year - does not include century */

t.tm_wday = 4; /* Day of the week */

t.tm_yday = 0; /* Does not show in asctime */

t.tm_isdst = 0; /* Is Daylight SavTime; does not show in asctime */

/* converts structure to null terminated

string */

strcpy(str, asctime(t));

printf("%s\n", str);

return 0;

}

函數名: asin

功能: 反正弦函數

用法: double asin(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = asin(x);

printf("The arc sin of %lf is %lf\n", x, result);

return(0);

}

函數名: assert

功能: 測試一個條件并可能使程序終止

用法: void assert(int test);

程序例:

#include assert.h

#include stdio.h

#include stdlib.h

struct ITEM {

int key;

int value;

};

/* add item to list, make sure list is not null */

void additem(struct ITEM *itemptr) {

assert(itemptr != NULL);

/* add item to list */

}

int main(void)

{

additem(NULL);

return 0;

}

函數名: atan

功能: 反正切函數

用法: double atan(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = atan(x);

printf("The arc tangent of %lf is %lf\n", x, result);

return(0);

}

函數名: atan2

功能: 計算Y/X的反正切值

用法: double atan2(double y, double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 90.0, y = 45.0;

result = atan2(y, x);

printf("The arc tangent ratio of %lf is %lf\n", (y / x), result);

return 0;

}

函數名: atexit

功能: 注冊終止函數

用法: int atexit(atexit_t func);

程序例:

#include stdio.h

#include stdlib.h

void exit_fn1(void)

{

printf("Exit function #1 called\n");

}

void exit_fn2(void)

{

printf("Exit function #2 called\n");

}

int main(void)

{

/* post exit function #1 */

atexit(exit_fn1);

/* post exit function #2 */

atexit(exit_fn2);

return 0;

}

函數名: atof

功能: 把字符串轉換成浮點數

用法: double atof(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

float f;

char *str = "12345.67";

f = atof(str);

printf("string = %s float = %f\n", str, f);

return 0;

}

函數名: atoi

功能: 把字符串轉換成長整型數

用法: int atoi(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

int n;

char *str = "12345.67";

n = atoi(str);

printf("string = %s integer = %d\n", str, n);

return 0;

}

函數名: atol

功能: 把字符串轉換成長整型數

用法: long atol(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

long l;

char *str = "98765432";

l = atol(lstr);

printf("string = %s integer = %ld\n", str, l);

return(0);

}

關于c語言宏定義

typedef unsigned char BYTE;

typedef unsigned short WORD;

意思是可以用BYTE替代unsigned char

是對的，BYTE，WORD是新的變量類型

#define LOBYTE(w) ((BYTE)(WORD)(w))

這里是宏定義。類似函數定義，w作為參數，是文本。在編譯時把LOBYTE(w)變為 ((BYTE)(WORD)(w))。比如輸入:

WORD dat;

BYTE b ;

b=LOBYTE(dat);

編譯時會替換為b=((BYTE)(WORD)(dat));意思是得到低字節部分。

同理HIBYTE得到高字節部分

網站題目：c語言LOBYTE函數 c語言ioctl函數
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